1# SPDX-License-Identifier: GPL-2.0 2# 3# For a description of the syntax of this configuration file, 4# see Documentation/kbuild/kconfig-language.rst. 5# 6# Auxiliary display drivers configuration. 7# 8 9menuconfig AUXDISPLAY 10 bool "Auxiliary Display support" 11 help 12 Say Y here to get to see options for auxiliary display drivers. 13 This option alone does not add any kernel code. 14 15 If you say N, all options in this submenu will be skipped and disabled. 16 17if AUXDISPLAY 18 19config CHARLCD 20 tristate "Character LCD core support" if COMPILE_TEST 21 help 22 This is the base system for character-based LCD displays. 23 It makes no sense to have this alone, you select your display driver 24 and if it needs the charlcd core, it will select it automatically. 25 This is some character LCD core interface that multiple drivers can 26 use. 27 28config LINEDISP 29 tristate "Character line display core support" if COMPILE_TEST 30 help 31 This is the core support for single-line character displays, to be 32 selected by drivers that use it. 33 34config HD44780_COMMON 35 tristate "Common functions for HD44780 (and compatibles) LCD displays" if COMPILE_TEST 36 select CHARLCD 37 help 38 This is a module with the common symbols for HD44780 (and compatibles) 39 displays. This is the code that multiple other modules use. It is not 40 useful alone. If you have some sort of HD44780 compatible display, 41 you very likely use this. It is selected automatically by selecting 42 your concrete display. 43 44config HD44780 45 tristate "HD44780 Character LCD support" 46 depends on GPIOLIB || COMPILE_TEST 47 select HD44780_COMMON 48 help 49 Enable support for Character LCDs using a HD44780 controller. 50 The LCD is accessible through the /dev/lcd char device (10, 156). 51 This code can either be compiled as a module, or linked into the 52 kernel and started at boot. 53 If you don't understand what all this is about, say N. 54 55config KS0108 56 tristate "KS0108 LCD Controller" 57 depends on PARPORT_PC 58 default n 59 help 60 If you have a LCD controlled by one or more KS0108 61 controllers, say Y. You will need also another more specific 62 driver for your LCD. 63 64 Depends on Parallel Port support. If you say Y at 65 parport, you will be able to compile this as a module (M) 66 and built-in as well (Y). 67 68 To compile this as a module, choose M here: 69 the module will be called ks0108. 70 71 If unsure, say N. 72 73config KS0108_PORT 74 hex "Parallel port where the LCD is connected" 75 depends on KS0108 76 default 0x378 77 help 78 The address of the parallel port where the LCD is connected. 79 80 The first standard parallel port address is 0x378. 81 The second standard parallel port address is 0x278. 82 The third standard parallel port address is 0x3BC. 83 84 You can specify a different address if you need. 85 86 If you don't know what I'm talking about, load the parport module, 87 and execute "dmesg" or "cat /proc/ioports". You can see there how 88 many parallel ports are present and which address each one has. 89 90 Usually you only need to use 0x378. 91 92 If you compile this as a module, you can still override this 93 using the module parameters. 94 95config KS0108_DELAY 96 int "Delay between each control writing (microseconds)" 97 depends on KS0108 98 default "2" 99 help 100 Amount of time the ks0108 should wait between each control write 101 to the parallel port. 102 103 If your LCD seems to miss random writings, increment this. 104 105 If you don't know what I'm talking about, ignore it. 106 107 If you compile this as a module, you can still override this 108 value using the module parameters. 109 110config CFAG12864B 111 tristate "CFAG12864B LCD" 112 depends on X86 113 depends on FB 114 depends on KS0108 115 select FB_SYSMEM_HELPERS 116 default n 117 help 118 If you have a Crystalfontz 128x64 2-color LCD, cfag12864b Series, 119 say Y. You also need the ks0108 LCD Controller driver. 120 121 For help about how to wire your LCD to the parallel port, 122 check Documentation/admin-guide/auxdisplay/cfag12864b.rst 123 124 Depends on the x86 arch and the framebuffer support. 125 126 The LCD framebuffer driver can be attached to a console. 127 It will work fine. However, you can't attach it to the fbdev driver 128 of the xorg server. 129 130 To compile this as a module, choose M here: 131 the modules will be called cfag12864b and cfag12864bfb. 132 133 If unsure, say N. 134 135config CFAG12864B_RATE 136 int "Refresh rate (hertz)" 137 depends on CFAG12864B 138 default "20" 139 help 140 Refresh rate of the LCD. 141 142 As the LCD is not memory mapped, the driver has to make the work by 143 software. This means you should be careful setting this value higher. 144 If your CPUs are really slow or you feel the system is slowed down, 145 decrease the value. 146 147 Be careful modifying this value to a very high value: 148 You can freeze the computer, or the LCD maybe can't draw as fast as you 149 are requesting. 150 151 If you don't know what I'm talking about, ignore it. 152 153 If you compile this as a module, you can still override this 154 value using the module parameters. 155 156config IMG_ASCII_LCD 157 tristate "Imagination Technologies ASCII LCD Display" 158 depends on HAS_IOMEM 159 default y if MIPS_MALTA 160 select MFD_SYSCON 161 select LINEDISP 162 help 163 Enable this to support the simple ASCII LCD displays found on 164 development boards such as the MIPS Boston, MIPS Malta & MIPS SEAD3 165 from Imagination Technologies. 166 167config HT16K33 168 tristate "Holtek Ht16K33 LED controller with keyscan" 169 depends on FB && I2C && INPUT 170 select FB_SYSMEM_HELPERS 171 select INPUT_MATRIXKMAP 172 select FB_BACKLIGHT 173 select NEW_LEDS 174 select LEDS_CLASS 175 select LINEDISP 176 help 177 Say yes here to add support for Holtek HT16K33, RAM mapping 16*8 178 LED controller driver with keyscan. 179 180config MAX6959 181 tristate "Maxim MAX6958/6959 7-segment LED controller" 182 depends on I2C 183 select REGMAP_I2C 184 select LINEDISP 185 help 186 If you say yes here you get support for the following Maxim chips 187 (I2C 7-segment LED display controller): 188 - MAX6958 189 - MAX6959 (input support) 190 191 This driver can also be built as a module. If so, the module 192 will be called max6959. 193 194config LCD2S 195 tristate "lcd2s 20x4 character display over I2C console" 196 depends on I2C 197 select CHARLCD 198 help 199 This is a driver that lets you use the lcd2s 20x4 character display 200 from Modtronix engineering as a console output device. The display 201 is a simple single color character display. You have to connect it 202 to an I2C bus. 203 204config ARM_CHARLCD 205 bool "ARM Ltd. Character LCD Driver" 206 depends on PLAT_VERSATILE 207 help 208 This is a driver for the character LCD found on the ARM Ltd. 209 Versatile and RealView Platform Baseboards. It doesn't do 210 very much more than display the text "ARM Linux" on the first 211 line and the Linux version on the second line, but that's 212 still useful. 213 214config SEG_LED_GPIO 215 tristate "Generic 7-segment LED display" 216 depends on GPIOLIB || COMPILE_TEST 217 select LINEDISP 218 help 219 This driver supports a generic 7-segment LED display made up 220 of GPIO pins connected to the individual segments. 221 222 This driver can also be built as a module. If so, the module 223 will be called seg-led-gpio. 224 225menuconfig PARPORT_PANEL 226 tristate "Parallel port LCD/Keypad Panel support" 227 depends on PARPORT 228 select HD44780_COMMON 229 help 230 Say Y here if you have an HD44780 or KS-0074 LCD connected to your 231 parallel port. This driver also features 4 and 6-key keypads. The LCD 232 is accessible through the /dev/lcd char device (10, 156), and the 233 keypad through /dev/keypad (10, 185). This code can either be 234 compiled as a module, or linked into the kernel and started at boot. 235 If you don't understand what all this is about, say N. 236 237if PARPORT_PANEL 238 239config PANEL_PARPORT 240 int "Default parallel port number (0=LPT1)" 241 range 0 255 242 default "0" 243 help 244 This is the index of the parallel port the panel is connected to. One 245 driver instance only supports one parallel port, so if your keypad 246 and LCD are connected to two separate ports, you have to start two 247 modules with different arguments. Numbering starts with '0' for LPT1, 248 and so on. 249 250config PANEL_PROFILE 251 int "Default panel profile (0-5, 0=custom)" 252 range 0 5 253 default "5" 254 help 255 To ease configuration, the driver supports different configuration 256 profiles for past and recent wirings. These profiles can also be 257 used to define an approximative configuration, completed by a few 258 other options. Here are the profiles : 259 260 0 = custom (see further) 261 1 = 2x16 parallel LCD, old keypad 262 2 = 2x16 serial LCD (KS-0074), new keypad 263 3 = 2x16 parallel LCD (Hantronix), no keypad 264 4 = 2x16 parallel LCD (Nexcom NSA1045) with Nexcom's keypad 265 5 = 2x40 parallel LCD (old one), with old keypad 266 267 Custom configurations allow you to define how your display is 268 wired to the parallel port, and how it works. This is only intended 269 for experts. 270 271config PANEL_KEYPAD 272 depends on PANEL_PROFILE="0" 273 int "Keypad type (0=none, 1=old 6 keys, 2=new 6 keys, 3=Nexcom 4 keys)" 274 range 0 3 275 default 0 276 help 277 This enables and configures a keypad connected to the parallel port. 278 The keys will be read from character device 10,185. Valid values are : 279 280 0 : do not enable this driver 281 1 : old 6 keys keypad 282 2 : new 6 keys keypad, as used on the server at www.ant-computing.com 283 3 : Nexcom NSA1045's 4 keys keypad 284 285 New profiles can be described in the driver source. The driver also 286 supports simultaneous keys pressed when the keypad supports them. 287 288config PANEL_LCD 289 depends on PANEL_PROFILE="0" 290 int "LCD type (0=none, 1=custom, 2=old //, 3=ks0074, 4=hantronix, 5=Nexcom)" 291 range 0 5 292 default 0 293 help 294 This enables and configures an LCD connected to the parallel port. 295 The driver includes an interpreter for escape codes starting with 296 '\e[L' which are specific to the LCD, and a few ANSI codes. The 297 driver will be registered as character device 10,156, usually 298 under the name '/dev/lcd'. There are a total of 6 supported types : 299 300 0 : do not enable the driver 301 1 : custom configuration and wiring (see further) 302 2 : 2x16 & 2x40 parallel LCD (old wiring) 303 3 : 2x16 serial LCD (KS-0074 based) 304 4 : 2x16 parallel LCD (Hantronix wiring) 305 5 : 2x16 parallel LCD (Nexcom wiring) 306 307 When type '1' is specified, other options will appear to configure 308 more precise aspects (wiring, dimensions, protocol, ...). Please note 309 that those values changed from the 2.4 driver for better consistency. 310 311config PANEL_LCD_HEIGHT 312 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 313 int "Number of lines on the LCD (1-2)" 314 range 1 2 315 default 2 316 help 317 This is the number of visible character lines on the LCD in custom profile. 318 It can either be 1 or 2. 319 320config PANEL_LCD_WIDTH 321 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 322 int "Number of characters per line on the LCD (1-40)" 323 range 1 40 324 default 40 325 help 326 This is the number of characters per line on the LCD in custom profile. 327 Common values are 16,20,24,40. 328 329config PANEL_LCD_BWIDTH 330 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 331 int "Internal LCD line width (1-40, 40 by default)" 332 range 1 40 333 default 40 334 help 335 Most LCDs use a standard controller which supports hardware lines of 40 336 characters, although sometimes only 16, 20 or 24 of them are really wired 337 to the terminal. This results in some non-visible but addressable characters, 338 and is the case for most parallel LCDs. Other LCDs, and some serial ones, 339 however, use the same line width internally as what is visible. The KS0074 340 for example, uses 16 characters per line for 16 visible characters per line. 341 342 This option lets you configure the value used by your LCD in 'custom' profile. 343 If you don't know, put '40' here. 344 345config PANEL_LCD_HWIDTH 346 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 347 int "Hardware LCD line width (1-64, 64 by default)" 348 range 1 64 349 default 64 350 help 351 Most LCDs use a single address bit to differentiate line 0 and line 1. Since 352 some of them need to be able to address 40 chars with the lower bits, they 353 often use the immediately superior power of 2, which is 64, to address the 354 next line. 355 356 If you don't know what your LCD uses, in doubt let 16 here for a 2x16, and 357 64 here for a 2x40. 358 359config PANEL_LCD_CHARSET 360 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 361 int "LCD character set (0=normal, 1=KS0074)" 362 range 0 1 363 default 0 364 help 365 Some controllers such as the KS0074 use a somewhat strange character set 366 where many symbols are at unusual places. The driver knows how to map 367 'standard' ASCII characters to the character sets used by these controllers. 368 Valid values are : 369 370 0 : normal (untranslated) character set 371 1 : KS0074 character set 372 373 If you don't know, use the normal one (0). 374 375config PANEL_LCD_PROTO 376 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 377 int "LCD communication mode (0=parallel 8 bits, 1=serial)" 378 range 0 1 379 default 0 380 help 381 This driver now supports any serial or parallel LCD wired to a parallel 382 port. But before assigning signals, the driver needs to know if it will 383 be driving a serial LCD or a parallel one. Serial LCDs only use 2 wires 384 (SDA/SCL), while parallel ones use 2 or 3 wires for the control signals 385 (E, RS, sometimes RW), and 4 or 8 for the data. Use 0 here for a 8 bits 386 parallel LCD, and 1 for a serial LCD. 387 388config PANEL_LCD_PIN_E 389 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0" 390 int "Parallel port pin number & polarity connected to the LCD E signal (-17...17) " 391 range -17 17 392 default 14 393 help 394 This describes the number of the parallel port pin to which the LCD 'E' 395 signal has been connected. It can be : 396 397 0 : no connection (eg: connected to ground) 398 1..17 : directly connected to any of these pins on the DB25 plug 399 -1..-17 : connected to the same pin through an inverter (eg: transistor). 400 401 Default for the 'E' pin in custom profile is '14' (AUTOFEED). 402 403config PANEL_LCD_PIN_RS 404 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0" 405 int "Parallel port pin number & polarity connected to the LCD RS signal (-17...17) " 406 range -17 17 407 default 17 408 help 409 This describes the number of the parallel port pin to which the LCD 'RS' 410 signal has been connected. It can be : 411 412 0 : no connection (eg: connected to ground) 413 1..17 : directly connected to any of these pins on the DB25 plug 414 -1..-17 : connected to the same pin through an inverter (eg: transistor). 415 416 Default for the 'RS' pin in custom profile is '17' (SELECT IN). 417 418config PANEL_LCD_PIN_RW 419 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0" 420 int "Parallel port pin number & polarity connected to the LCD RW signal (-17...17) " 421 range -17 17 422 default 16 423 help 424 This describes the number of the parallel port pin to which the LCD 'RW' 425 signal has been connected. It can be : 426 427 0 : no connection (eg: connected to ground) 428 1..17 : directly connected to any of these pins on the DB25 plug 429 -1..-17 : connected to the same pin through an inverter (eg: transistor). 430 431 Default for the 'RW' pin in custom profile is '16' (INIT). 432 433config PANEL_LCD_PIN_SCL 434 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0" 435 int "Parallel port pin number & polarity connected to the LCD SCL signal (-17...17) " 436 range -17 17 437 default 1 438 help 439 This describes the number of the parallel port pin to which the serial 440 LCD 'SCL' signal has been connected. It can be : 441 442 0 : no connection (eg: connected to ground) 443 1..17 : directly connected to any of these pins on the DB25 plug 444 -1..-17 : connected to the same pin through an inverter (eg: transistor). 445 446 Default for the 'SCL' pin in custom profile is '1' (STROBE). 447 448config PANEL_LCD_PIN_SDA 449 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0" 450 int "Parallel port pin number & polarity connected to the LCD SDA signal (-17...17) " 451 range -17 17 452 default 2 453 help 454 This describes the number of the parallel port pin to which the serial 455 LCD 'SDA' signal has been connected. It can be : 456 457 0 : no connection (eg: connected to ground) 458 1..17 : directly connected to any of these pins on the DB25 plug 459 -1..-17 : connected to the same pin through an inverter (eg: transistor). 460 461 Default for the 'SDA' pin in custom profile is '2' (D0). 462 463config PANEL_LCD_PIN_BL 464 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 465 int "Parallel port pin number & polarity connected to the LCD backlight signal (-17...17) " 466 range -17 17 467 default 0 468 help 469 This describes the number of the parallel port pin to which the LCD 'BL' signal 470 has been connected. It can be : 471 472 0 : no connection (eg: connected to ground) 473 1..17 : directly connected to any of these pins on the DB25 plug 474 -1..-17 : connected to the same pin through an inverter (eg: transistor). 475 476 Default for the 'BL' pin in custom profile is '0' (uncontrolled). 477 478endif # PARPORT_PANEL 479 480config PANEL_CHANGE_MESSAGE 481 bool "Change LCD initialization message ?" 482 depends on CHARLCD 483 default "n" 484 help 485 This allows you to replace the boot message indicating the kernel version 486 and the driver version with a custom message. This is useful on appliances 487 where a simple 'Starting system' message can be enough to stop a customer 488 from worrying. 489 490 If you say 'Y' here, you'll be able to choose a message yourself. Otherwise, 491 say 'N' and keep the default message with the version. 492 493config PANEL_BOOT_MESSAGE 494 depends on PANEL_CHANGE_MESSAGE="y" 495 string "New initialization message" 496 default "" 497 help 498 This allows you to replace the boot message indicating the kernel version 499 and the driver version with a custom message. This is useful on appliances 500 where a simple 'Starting system' message can be enough to stop a customer 501 from worrying. 502 503 An empty message will only clear the display at driver init time. Any other 504 printf()-formatted message is valid with newline and escape codes. 505 506choice 507 prompt "Backlight initial state" 508 default CHARLCD_BL_FLASH 509 help 510 Select the initial backlight state on boot or module load. 511 512 Previously, there was no option for this: the backlight flashed 513 briefly on init. Now you can also turn it off/on. 514 515 config CHARLCD_BL_OFF 516 bool "Off" 517 help 518 Backlight is initially turned off 519 520 config CHARLCD_BL_ON 521 bool "On" 522 help 523 Backlight is initially turned on 524 525 config CHARLCD_BL_FLASH 526 bool "Flash" 527 help 528 Backlight is flashed briefly on init 529 530endchoice 531 532endif # AUXDISPLAY 533 534config PANEL 535 tristate "Parallel port LCD/Keypad Panel support (OLD OPTION)" 536 depends on PARPORT 537 select AUXDISPLAY 538 select PARPORT_PANEL 539